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More ambition is needed when it comes to international climate change negotiations. That's according to the UN's new climate chief Christiana Figueres. One Planet managed to grab a quick chat with the Costa Rican diplomat just hours after her appointment was announced by UN secretary-general Ban Ki-Moon.

"It's time to make more effort, it's time to be more ambitious," Ms Figueres told Mike in a telephone conversation.

She will take over the reins from outgoing chief Yvo De Boer in July, and was keen to stress that the Copenhagen summit had not been a failure. Climate change is now "at the top of every political agenda in every country," Ms Figueres told Mike.

Tune in to the interview and then let us know what you think - email the team at oneplanet@bbc.com.

Also in this week's show we meet up with US actress Daryl Hannah to talk about her life as an environmental campaigner. Download the free podcast to hear the star of Kill Bill reveal her three commandments to live your life by.

We've also got an interview with one of the world's largest airplane manufacturers, and someone tells us why it's time to rename our home planet.

Plus, Mike goes cloud spotting. Thanks to all our Facebook fans who sent in pictures of clouds where they live - we loved them all. If you want to join the One Planet team on Facebook, the link's below. Hope to see you there.